- Companies
- Installers
- Carshalton
- SJB Sash Windows Specialist Ltd
SJB Sash Windows Specialist Ltd
- Company number
- 10453404
- Incorporated
- 31 Oct 20169 years trading
- Registered office
- 4 the Market, Wrythe Lane, Carshalton, Surrey, SM5 1AG
- Nature of business
- Other construction installation
SJB Sash Windows Specialist Ltd is a 9-year-old private limited company registered in Carshalton, company number 10453404, one of 15 installation companies (insulation, lifts, shutters and similar) in Carshalton. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £170K (+10.3%) on the year before, to £1.8M.
- Current assets of £2.2M against £446K owed within a year: 5.0 times cover.
- 15 employees on average, down from 19 the year before.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | £1.8M | £743K | £2.2M | £446K | 15 |
| 31 Oct 2024 | £1.6M | £652K | £1.9M | £353K | 19 |
| 31 Oct 2023 | £1.4M | £854K | £1.8M | £524K | 16 |
Where SJB Sash Windows Specialist Ltd is registered
The registered office is in Carshalton (SM5), in the Sutton local authority area, London. Show SM5 1AG on a map.
Other trade companies in SM5
- Rich Detailz LtdMechanics and garages
- Sutton Motor and Garage LtdMechanics and garages
- Ecobuild Plumbing & Heating LtdPlumbers and heating engineers
- Aaircon Services LtdPlumbers and heating engineers
- Perthy Properties (Greenhills) LimitedProperty developers
- Jophp LimitedCleaning companies
- Pro-Type Roofing LtdRoofers
- Mic Cleaning LimitedCleaning companies
What happens if SJB Sash Windows Specialist Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 10453404
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 31 October 2016 (9 years ago)
- Registered office
- 4 the Market, Wrythe Lane, Carshalton, Surrey, SM5 1AG
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 17 December 2025
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Carshalton
Other active installation companies (insulation, lifts, shutters and similar) registered in Carshalton.
- The Evergreen Loft Company Ltd2010
- Vas Build Ltd2026
- Alex Junior Ltd2012
- Amz Building Services Limited2016
- Az Building Projects Ltd2017
- Bijan Joinery Ltd2012
- DJH Site Services Limited2025
- Imperium Building Systems Limited2014
All installation companies (insulation, lifts, shutters and similar) in Carshalton · All trades in Carshalton · Installers across the UK
Frequently asked questions
When are SJB Sash Windows Specialist Ltd's accounts due?
SJB Sash Windows Specialist Ltd's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is SJB Sash Windows Specialist Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is SJB Sash Windows Specialist Ltd still trading?
SJB Sash Windows Specialist Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does SJB Sash Windows Specialist Ltd do?
SJB Sash Windows Specialist Ltd is registered under Other construction installation (SIC 43290).
How old is SJB Sash Windows Specialist Ltd?
SJB Sash Windows Specialist Ltd was incorporated on 31 October 2016, 9 years ago.
What is the penalty if SJB Sash Windows Specialist Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View SJB Sash Windows Specialist Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.